Reinstate llbase.fastest_elementtree (proxy for module in llsd)

[nat-goodspeed]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@62985c0). Click here to learn what that means.
The diff coverage is 0.00%.

❗ Current head bc0e578 differs from pull request most recent head c4ea325. Consider uploading reports for the commit c4ea325 to get more accurate results

@@           Coverage Diff           @@
##             main       #2   +/-   ##
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  Coverage        ?   68.89%           
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  Files           ?        8           
  Lines           ?     1180           
  Branches        ?        0           
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  Hits            ?      813           
  Misses          ?      367           
  Partials        ?        0           

Impacted Files	Coverage Δ
llbase/fastest_elementtree.py	0.00% <0.00%> (ø)

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